mirror of
https://github.com/FFmpeg/FFmpeg.git
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b9c928a486
This flag allows distinguishing between filters that actually modify the data and those that only modify metadata or gather some stream information.
270 lines
8.0 KiB
C
270 lines
8.0 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avassert.h"
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#include "libavutil/eval.h"
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#include "libavutil/opt.h"
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#include "avfilter.h"
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#include "internal.h"
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enum {
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X, Y, W, H,
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NB_PARAMS,
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};
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static const char addroi_param_names[] = {
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'x', 'y', 'w', 'h',
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};
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enum {
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VAR_IW,
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VAR_IH,
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NB_VARS,
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};
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static const char *const addroi_var_names[] = {
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"iw",
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"ih",
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};
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typedef struct AddROIContext {
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const AVClass *class;
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char *region_str[NB_PARAMS];
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AVExpr *region_expr[NB_PARAMS];
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int region[NB_PARAMS];
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AVRational qoffset;
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int clear;
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} AddROIContext;
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static int addroi_config_input(AVFilterLink *inlink)
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{
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AVFilterContext *avctx = inlink->dst;
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AddROIContext *ctx = avctx->priv;
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int i;
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double vars[NB_VARS];
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double val;
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vars[VAR_IW] = inlink->w;
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vars[VAR_IH] = inlink->h;
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for (i = 0; i < NB_PARAMS; i++) {
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int max_value;
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switch (i) {
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case X: max_value = inlink->w; break;
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case Y: max_value = inlink->h; break;
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case W: max_value = inlink->w - ctx->region[X]; break;
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case H: max_value = inlink->h - ctx->region[Y]; break;
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}
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val = av_expr_eval(ctx->region_expr[i], vars, NULL);
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if (val < 0.0) {
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av_log(avctx, AV_LOG_WARNING, "Calculated value %g for %c is "
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"less than zero - using zero instead.\n", val,
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addroi_param_names[i]);
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val = 0.0;
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} else if (val > max_value) {
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av_log(avctx, AV_LOG_WARNING, "Calculated value %g for %c is "
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"greater than maximum allowed value %d - "
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"using %d instead.\n", val, addroi_param_names[i],
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max_value, max_value);
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val = max_value;
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}
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ctx->region[i] = val;
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}
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return 0;
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}
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static int addroi_filter_frame(AVFilterLink *inlink, AVFrame *frame)
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{
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AVFilterContext *avctx = inlink->dst;
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AVFilterLink *outlink = avctx->outputs[0];
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AddROIContext *ctx = avctx->priv;
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AVRegionOfInterest *roi;
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AVFrameSideData *sd;
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int err;
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if (ctx->clear) {
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av_frame_remove_side_data(frame, AV_FRAME_DATA_REGIONS_OF_INTEREST);
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sd = NULL;
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} else {
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sd = av_frame_get_side_data(frame, AV_FRAME_DATA_REGIONS_OF_INTEREST);
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}
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if (sd) {
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const AVRegionOfInterest *old_roi;
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uint32_t old_roi_size;
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AVBufferRef *roi_ref;
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int nb_roi, i;
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old_roi = (const AVRegionOfInterest*)sd->data;
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old_roi_size = old_roi->self_size;
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av_assert0(old_roi_size && sd->size % old_roi_size == 0);
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nb_roi = sd->size / old_roi_size + 1;
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roi_ref = av_buffer_alloc(sizeof(*roi) * nb_roi);
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if (!roi_ref) {
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err = AVERROR(ENOMEM);
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goto fail;
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}
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roi = (AVRegionOfInterest*)roi_ref->data;
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for (i = 0; i < nb_roi - 1; i++) {
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old_roi = (const AVRegionOfInterest*)
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(sd->data + old_roi_size * i);
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roi[i] = (AVRegionOfInterest) {
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.self_size = sizeof(*roi),
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.top = old_roi->top,
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.bottom = old_roi->bottom,
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.left = old_roi->left,
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.right = old_roi->right,
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.qoffset = old_roi->qoffset,
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};
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}
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roi[nb_roi - 1] = (AVRegionOfInterest) {
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.self_size = sizeof(*roi),
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.top = ctx->region[Y],
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.bottom = ctx->region[Y] + ctx->region[H],
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.left = ctx->region[X],
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.right = ctx->region[X] + ctx->region[W],
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.qoffset = ctx->qoffset,
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};
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av_frame_remove_side_data(frame, AV_FRAME_DATA_REGIONS_OF_INTEREST);
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sd = av_frame_new_side_data_from_buf(frame,
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AV_FRAME_DATA_REGIONS_OF_INTEREST,
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roi_ref);
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if (!sd) {
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av_buffer_unref(&roi_ref);
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err = AVERROR(ENOMEM);
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goto fail;
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}
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} else {
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sd = av_frame_new_side_data(frame, AV_FRAME_DATA_REGIONS_OF_INTEREST,
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sizeof(AVRegionOfInterest));
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if (!sd) {
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err = AVERROR(ENOMEM);
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goto fail;
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}
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roi = (AVRegionOfInterest*)sd->data;
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*roi = (AVRegionOfInterest) {
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.self_size = sizeof(*roi),
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.top = ctx->region[Y],
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.bottom = ctx->region[Y] + ctx->region[H],
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.left = ctx->region[X],
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.right = ctx->region[X] + ctx->region[W],
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.qoffset = ctx->qoffset,
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};
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}
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return ff_filter_frame(outlink, frame);
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fail:
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av_frame_free(&frame);
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return err;
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}
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static av_cold int addroi_init(AVFilterContext *avctx)
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{
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AddROIContext *ctx = avctx->priv;
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int i, err;
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for (i = 0; i < NB_PARAMS; i++) {
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err = av_expr_parse(&ctx->region_expr[i], ctx->region_str[i],
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addroi_var_names, NULL, NULL, NULL, NULL,
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0, avctx);
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if (err < 0) {
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av_log(ctx, AV_LOG_ERROR,
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"Error parsing %c expression '%s'.\n",
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addroi_param_names[i], ctx->region_str[i]);
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return err;
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}
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}
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return 0;
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}
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static av_cold void addroi_uninit(AVFilterContext *avctx)
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{
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AddROIContext *ctx = avctx->priv;
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int i;
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for (i = 0; i < NB_PARAMS; i++) {
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av_expr_free(ctx->region_expr[i]);
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ctx->region_expr[i] = NULL;
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}
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}
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#define OFFSET(x) offsetof(AddROIContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption addroi_options[] = {
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{ "x", "Region distance from left edge of frame.",
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OFFSET(region_str[X]), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
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{ "y", "Region distance from top edge of frame.",
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OFFSET(region_str[Y]), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
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{ "w", "Region width.",
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OFFSET(region_str[W]), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
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{ "h", "Region height.",
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OFFSET(region_str[H]), AV_OPT_TYPE_STRING, { .str = "0" }, .flags = FLAGS },
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{ "qoffset", "Quantisation offset to apply in the region.",
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OFFSET(qoffset), AV_OPT_TYPE_RATIONAL, { .dbl = -0.1 }, -1, +1, FLAGS },
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{ "clear", "Remove any existing regions of interest before adding the new one.",
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OFFSET(clear), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(addroi);
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static const AVFilterPad addroi_inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.config_props = addroi_config_input,
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.filter_frame = addroi_filter_frame,
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},
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};
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static const AVFilterPad addroi_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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},
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};
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const AVFilter ff_vf_addroi = {
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.name = "addroi",
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.description = NULL_IF_CONFIG_SMALL("Add region of interest to frame."),
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.init = addroi_init,
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.uninit = addroi_uninit,
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.priv_size = sizeof(AddROIContext),
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.priv_class = &addroi_class,
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.flags = AVFILTER_FLAG_METADATA_ONLY,
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FILTER_INPUTS(addroi_inputs),
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FILTER_OUTPUTS(addroi_outputs),
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};
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